Junction for conductors of systems of electrical distribution



' (No Model.)

J. KRUESI.

JUNCTION FOR OONDUOTORS OF SYSTEMS OF ELECTRICAL DISTRIBUTION.

Patented Oct. 24, 1882.

HIIILIIISIIIIJW 0 minimum WITNESSES ATTORNEY.

UNITED STATES PATENT JOHN KRUEST, OF MENLO PARK, NEW JE ZSEY.

JUNCTION FOR CONDUCTORS OF SYSTEMS OF ELECTRICAL DISTRIBUTION.

SPECIFICATION forming part of Letters Patent No. 266,483, dated October24, 1882.

(No model.)

To all whom it may concern:

Be it known that I, JOHN KniUltsi, of Menlo Park, in the county ofMiddlesex and State of New Jersey, have invented a certain new anduseful Improvement. in Junctions t'or Conductors of Systems ofElectrical Distribution, of which the following is a specification.

My invention relates more especially to the junctions and junctioirboxes of conductors arranged and connected for systems ofelectrical distribution for supplying lights, motors, &c., whichconductors are rods or strips of copper or other metal carried byinclosing metallic tubes and insulated t'romeach other and from theinclosing-tubes, such tubes being constructed in sections and enteringat theirends metallic boxes in which the proper connections of theconductors which project beyond the ends of the inclosing-tubes aremade.

The object 1 have in view is to give a simple, compact, andhighly-efficient form to the several kinds of boxes used with conductorsof this class, and to provide means for attaching the inclosing-tubes tothe boxes, which means of attachment will be of such construction thatthe connections of the conductors at any box can first be made andcompleted be fore the box is applied, which enables the work to be donebetter and more economically, and the conductors will be relieved of thestrain which necessarily occurs when the tubes are placed in other thana horizontal position, such strain being taken by the inclosingtubes andboxes.

In the accompanying drawings, forming a part hereot,1 igure l is a topview of a servicebox laid open, showing the connections of theconductors and the attachment of the tubes to the box; Fig. 2, avertical section through one end of the box, the entering tube being inelevation; Fig. 3, a cross-section ofone ot the tubes; Fig. 1-, a topview of an elbow-box, the upper halt being removed; and Fig. 5, a topview of a T-box, the upper half being removed.

Like letters denote corresponding parts in all the figures.

A represents the inclo'sing metallic tubes, in which are the insulatedconductors B (J, the two parts of the circuit being carried by the sameline of inclosing-tubes, and the conductors being constructed andinsulated prelemlly as described in lhlisons Patent No. 251.553.

The tubes A at their ends are provided 1th adjustable collars D, whichare received by grooves or channels E in the boxes, such grooves orchannels being in the walls of the openings through which the tubes passto the interior of the boxes. These collars are made adjustable,preferably by screw-threading the ends of the tubes, and providing thecollars with female threads engaging with the male threads of the tubes;but the adjustment can be accomplished by means of set-screws, or byother suitable devices.

When the boxes are secured upon the ends of the tubes the collars l) areheld by the grooves E, and the tubes are prevented from moving withrespect to the boxes, such boxes forming snpportirig-connections betweenthe sections of tubes, which are practically rigid. Hence, it will beseen, the longitudinal strain or pressure will be taken by the tubes andthe boxes, and the connections of the conductors will be relieved otstrain.

By making the collars adjustable the conductors projecting from themeeting sections of tubing can be connected properly and the connectionssoldered and completed outside of the inclosing-box. The joint can thenbe covered by a box, the collars being adjusted to the grooves of thebox. This enables the connections to be made with greater facility andeconomy.

The inclosing-boxes are made in two similar longitudinal halves, F G,which have a rounded t'orm, approaching as nearly as possible the sizeand shape of the tubes. The parts of each box are provided with lugs a,which receive screws or bolts for securing the parts together. Byhz'tving the boxes made in two similar halves they can be handled andapplied inoie conveniently, and can be made of the compact form shown.

The box shown in Fig. 1 is a service-box, for use more especially withinbuildings, the conductors being connected by slcevepieces b, from whichrun insulated wires 0 out through holes d in one of the halves of thebox.

The elbow-box and the T-box (shown in Figs. and 5) are adapted forinside as well as outside work, the conductors being connected bysuitable conneetingpieces, 0 and f.

The boxes can be filled with an insulating and moisture-excludingcompound when their location requires it.

All the various boxes used in systems of conductors for electric lightand other purposes can be made upon the principle of the boxesdescribed,which are shown forillustration only.

\Vhile the conductors are shown as carried in pairs by theinclosing-tubes, they may be carried by separate tubes, in which casethe boxes would be constructed to receive twice the number of tubes, butotherwise would not require material change in construction.

\Vhat I claim is- 1. The combination, with the boxes havingtube-openings, of the tubes, and means for adjustably attaching thetubes to the boxes, substantially as set forth.

JOHN KRUESI.

\Vitnesses H. W. SEELY, 0. P. Mom.

